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Comparison of average precision of two different feature encryption methods.
| Type | Characteristic encryption time | Retrieve time after encryption | Traditional method |
|
| |||
| Feature randomization encryption | 5.0∗10 − 3 s | 1.10 s | 2.13 s |
| Order-preserving encryption | 1.10 s | 3.0 s | 5.12 s |
| Average precision rate (%) | 85.25 | 83.26 | — |
